From what I've read the polish pullets crown is more of a ball, while the cockerels will spread out and get pointy ends. I personally only have 1 polish, and it turned out to be a rooster. He started out with a ball shaped crown, but then it slowly spread out and he grew wattles. So with polish chickens its kind of hard to sex them.
By the looks of your two chicks here, I would say they are cockerels. But I'd get other people's opinions as well. Because mine could end up being wrong.